scheduler: Move the Blink scheduler into Blink

third_party/WebKit/Source/platform/testing/TestingPlatformSupport.cpp

Index: third_party/WebKit/Source/platform/testing/TestingPlatformSupport.cpp
diff --git a/third_party/WebKit/Source/platform/testing/TestingPlatformSupport.cpp b/third_party/WebKit/Source/platform/testing/TestingPlatformSupport.cpp
index 971224d393d4160be420ac58ac85cf3a3b5d995d..dde0f64e64a71c91a5261d7c42ae9edec91361b3 100644
--- a/third_party/WebKit/Source/platform/testing/TestingPlatformSupport.cpp
+++ b/third_party/WebKit/Source/platform/testing/TestingPlatformSupport.cpp
@@ -101,6 +101,12 @@ public:
         return 0.0;
     }
 
+    scoped_refptr<base::SingleThreadTaskRunner> taskRunner() override
+    {
+        ASSERT_NOT_REACHED();
+        return nullptr;
+    }
+
 private:
     Deque<std::unique_ptr<WebTaskRunner::Task>>* m_tasks; // NOT OWNED
 };